Sarah is profoundly repressed as a misdiagnosed autistic child. After treatment she blossoms into a kinky green-haired teenage prodigy confounding Cambridge Professors in a brilliant interview to read mathematics and cryptology at Russell College.
Her devoted father, David, is a misfit in naval intelligence, who is kidnapped in Budapest by a brutal ISIS regime, and threatened with dismemberment. He is befriended by Maryam, an enslaved Arabic tutor,...